oeqa/targetcontrol: restart method shouldn't be abstract

And drop the un-needed and un-used restart methods.
Only qemu ever used this and actually does it safely.

(From OE-Core rev: 1dd1edb5ea551c8a01538b130aa4d0c361eae14d)

Signed-off-by: Stefan Stanacar <stefanx.stanacar@intel.com>
Signed-off-by: Richard Purdie <richard.purdie@linuxfoundation.org>

meta/lib/oeqa/controllers/masterimage.py

@@ -133,9 +133,6 @@ class MasterImageHardwareTarget(oeqa.targetcontrol.BaseTarget):
         bb.plain("%s - reboot/powercycle target" % self.pn)
         self.power_cycle(self.connection)
 
-    def restart(self):
-        pass
-
 
 class GummibootTarget(MasterImageHardwareTarget):
 

meta/lib/oeqa/targetcontrol.py

@@ -70,9 +70,9 @@ class BaseTarget(object):
     def stop(self):
         pass
 
-    @abstractmethod
     def restart(self, params=None):
-        pass
+        self.stop()
+        self.start(params)
 
     def run(self, cmd, timeout=None):
         return self.connection.run(cmd, timeout)
@@ -170,6 +170,3 @@ class SimpleRemoteTarget(BaseTarget):
         self.connection = None
         self.ip = None
         self.server_ip = None
-
-    def restart(self, params=None):
-        pass